Apparatus

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sensors Mode-S transponder

71BD33

ICAO 24-bit transponder address · allocated to Korea, South

Currently assigned to HL7533 · BOEING 777-300

Hex
71BD33
Octal
34336463
Decimal
7,454,003
Country
KR
Tail
HL7533
Type
B773
No current signal · last broadcast 4h ago
Flights observed
181
Distinct callsigns
17
Country
KR
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 71BD33.

Country allocation

The ICAO 24-bit address 71BD33 falls within the block assigned to Korea, South (KR) by ICAO Annex 10, Volume III. Every aircraft registered in Korea, South receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 17 distinct

Callsign Airline Flights Last seen
KAL766 - 35 2026-07-14
KAL765 - 34 2026-07-14
KAL602 - 21 2026-07-13
KAL416 - 19 2026-07-09
KAL624 Korean Air 14 2026-06-17
KAL623 - 13 2026-06-17
KAL622 - 11 2026-06-20
KAL621 - 11 2026-06-19
KAL601 - 10 2026-07-14
KAL415 - 3 2026-06-30
KAL2021 - 3 2026-07-12
KAL2022 - 2 2026-07-12
KAL892 - 1 2026-07-12
KAL888 Korean Air 1 2026-05-16
KAL704 - 1 2026-06-18
KAL703 - 1 2026-06-18
KAL196P Korean Air 1 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL601 - Jul 14, 11:55 UTCJul 14, 13:25 UTC1h 30m
2026-07-14 KAL766 - Jul 14, 06:10 UTCJul 14, 08:30 UTC2h 20m
2026-07-14 KAL765 - Jul 14, 02:00 UTCJul 14, 04:15 UTC2h 15m
2026-07-13 KAL602 - Jul 13, 11:35 UTCJul 13, 21:15 UTC9h 40m
2026-07-12 KAL892 - Jul 12, 10:20 UTCJul 13, 02:50 UTC16h 30m
2026-07-12 KAL2022 - Jul 12, 05:55 UTCJul 12, 07:55 UTC2h 0m
2026-07-12 KAL2021 - Jul 12, 03:45 UTCJul 12, 04:15 UTC30m
2026-07-12 KAL2021 - Jul 12, 02:05 UTCJul 12, 02:45 UTC40m
2026-07-11 KAL602 - Jul 11, 14:40 UTCJul 12, 00:05 UTC9h 25m
2026-07-11 KAL766 - Jul 11, 06:10 UTCJul 11, 08:25 UTC2h 15m
2026-07-11 KAL765 - Jul 11, 01:55 UTCJul 11, 04:10 UTC2h 15m
2026-07-10 KAL601 - Jul 10, 12:00 UTCJul 10, 23:15 UTC11h 15m
2026-07-10 KAL766 - Jul 10, 06:15 UTCJul 10, 08:40 UTC2h 25m
2026-07-10 KAL765 ICN → CTS Jul 10, 02:00 UTCJul 10, 04:30 UTC2h 30m
2026-07-09 KAL416 - Jul 9, 01:45 UTCJul 9, 11:20 UTC9h 35m
2026-07-08 KAL416 - Jul 8, 01:40 UTCJul 8, 11:30 UTC9h 50m
2026-07-07 KAL766 - Jul 7, 06:15 UTCJul 7, 08:35 UTC2h 20m
2026-07-07 KAL765 - Jul 7, 02:05 UTCJul 7, 04:20 UTC2h 15m
2026-07-06 KAL766 - Jul 6, 06:05 UTCJul 6, 08:30 UTC2h 25m
2026-07-06 KAL765 - Jul 6, 02:15 UTCJul 6, 04:25 UTC2h 10m
2026-07-05 KAL602 ICN → ICN Jul 5, 11:25 UTCJul 5, 21:10 UTC9h 45m
2026-07-05 KAL766 - Jul 5, 06:05 UTCJul 5, 08:40 UTC2h 35m
2026-07-05 KAL765 - Jul 5, 02:00 UTCJul 5, 04:10 UTC2h 10m
2026-07-04 KAL416 - Jul 4, 01:25 UTCJul 4, 11:35 UTC10h 10m
2026-07-03 KAL602 - Jul 3, 11:40 UTCJul 3, 21:05 UTC9h 25m
2026-07-03 KAL766 - Jul 3, 06:10 UTCJul 3, 08:35 UTC2h 25m
2026-07-03 KAL765 - Jul 3, 01:50 UTCJul 3, 04:00 UTC2h 10m
2026-07-02 KAL416 - Jul 2, 01:35 UTCJul 2, 11:30 UTC9h 55m
2026-07-01 KAL2022 - Jul 1, 05:55 UTCJul 1, 08:10 UTC2h 15m
2026-07-01 KAL2021 - Jul 1, 02:05 UTCJul 1, 04:25 UTC2h 20m
2026-06-30 KAL415 ICN → ICN Jun 30, 01:30 UTCJun 30, 11:20 UTC9h 50m
2026-06-29 KAL601 - Jun 29, 12:00 UTCJun 29, 21:34 UTC9h 35m
2026-06-29 KAL766 - Jun 29, 06:14 UTCJun 29, 08:39 UTC2h 25m
2026-06-29 KAL765 ICN → CTS Jun 29, 02:00 UTCJun 29, 04:14 UTC2h 15m
2026-06-28 KAL602 - Jun 28, 11:25 UTCJun 28, 20:59 UTC9h 35m
2026-06-28 KAL766 - Jun 28, 06:10 UTCJun 28, 08:44 UTC2h 35m
2026-06-28 KAL765 ICN → CTS Jun 28, 01:50 UTCJun 28, 03:55 UTC2h 5m
2026-06-27 KAL415 ICN → ICN Jun 27, 01:24 UTCJun 27, 11:20 UTC9h 55m
2026-06-26 KAL602 ICN → ICN Jun 26, 11:34 UTCJun 26, 21:24 UTC9h 50m
2026-06-26 KAL766 - Jun 26, 06:39 UTCJun 26, 09:14 UTC2h 35m
2026-06-26 KAL765 - Jun 26, 02:05 UTCJun 26, 04:14 UTC2h 10m
2026-06-25 KAL602 - Jun 25, 11:39 UTCJun 25, 21:35 UTC9h 55m
2026-06-25 KAL766 - Jun 25, 06:09 UTCJun 25, 08:45 UTC2h 35m
2026-06-25 KAL765 - Jun 25, 01:54 UTCJun 25, 04:04 UTC2h 10m
2026-06-24 KAL416 - Jun 24, 01:24 UTCJun 24, 11:20 UTC9h 55m
2026-06-23 KAL602 ICN → ICN Jun 23, 11:49 UTCJun 23, 21:34 UTC9h 45m
2026-06-23 KAL766 - Jun 23, 06:04 UTCJun 23, 08:25 UTC2h 20m
2026-06-23 KAL765 - Jun 23, 01:54 UTCJun 23, 04:14 UTC2h 20m
2026-06-22 KAL416 - Jun 22, 01:25 UTCJun 22, 11:24 UTC10h 0m
2026-06-21 KAL601 - Jun 21, 11:34 UTCJun 21, 20:59 UTC9h 25m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the HL7533 page for operator, model, and routing details .

Mode-S 71BD33 frequently asked

What is Mode-S code 71BD33?
71BD33 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7533.
Where is Mode-S 71BD33 registered?
Mode-S code 71BD33 is allocated to Korea, South (KR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 71BD33 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BD33, octal 34336463, decimal 7,454,003.
What flights does 71BD33 operate?
Mode-S 71BD33 has broadcast 17 distinct callsigns, including KAL766, KAL765, KAL602, KAL416, KAL624.